Trench-Embedded GaAs Power Amplifier in Si Substrate
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Solution Overview
Problem
Current semiconductor technologies face challenges in integrating GaAs power amplifiers and switches with SiGe technologies due to space constraints, as SiGe technologies require more chip area for power amplifiers, limiting the space for other components like inductors and CMOS controller logic.
Innovation Solution
The integration of a smaller GaAs chip within a trench of a larger SiGe or Si substrate, embedded with a common dielectric material and connected via a shared back-end-of-line wiring layer, allowing both technologies to share the same backend structures and reduce the area required for power amplifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If power amplifiers are implemented in Si technologies, then CMOS controller logic integration is improved, but chip area increases significantly (exceeding 11% of chip space)
Solution Approach 1:
The patent embeds a GaAs chip containing power amplifier circuits into a trench structure formed in the Si substrate. This nesting approach allows the GaAs power amplifier to be housed within the Si chip footprint, effectively reducing the area occupied by power amplifiers while maintaining dense CMOS logic integration in the surrounding Si regions.
Solution Approach 2:
The patent applies different technology types in different regions of the chip: GaAs technology is used locally in the embedded chip for power amplification where high power handling is needed, while Si technology is used in the main substrate for CMOS controller logic where integration density is critical. This local quality differentiation resolves the area contradiction by optimizing each region for its specific function.
2Power
If GaAs technologies are used for power amplifiers, then power handling performance is improved, but chip area consumption increases
Solution Approach 1:
The GaAs chip is physically nested within a trench in the Si substrate, allowing the high-power GaAs amplifier to share the overall chip footprint with the Si controller logic. This eliminates the need for separate packaging and reduces the effective area consumption of GaAs power amplifiers.
Solution Approach 2:
The patent transitions from a planar layout where GaAs and Si components would occupy separate horizontal areas to a three-dimensional structure where the GaAs chip is embedded vertically within the Si substrate. This dimensional change allows both technologies to coexist within the same footprint, improving power density without increasing chip area.
3Adaptability or versatility
If separate chips are used for GaAs power amplifiers and SiGe logic, then manufacturing flexibility is maintained, but device complexity and integration difficulty increase
Solution Approach 1:
The patent merges the GaAs power amplifier chip and Si controller logic chip into a single integrated structure by embedding the GaAs chip in a trench of the Si substrate and connecting them through common back-end-of-line wiring. This combining approach maintains the manufacturing flexibility of using different technology processes while reducing integration complexity compared to packaging separate chips.
Solution Approach 2:
The Si substrate acts as an intermediary carrier that hosts both the embedded GaAs chip and the SiGe logic circuits. The common back-end-of-line wiring layer serves as an intermediary connection structure that interfaces both technology types, simplifying the integration process compared to direct chip-to-chip bonding.
Data Source
AI summary
The present disclosure relates to semiconductor structures and, more particularly, to integrated CMOS wafers and methods of manufacture. The structure includes: a chip of a first technology type comprising a trench structure on a front side; a chip of a second technology type positioned within the trench structure and embedded therein with an interlevel dielectric material; and a common wiring layer on the front side connecting to both the chip of the first technology type and the chip of the second technology type.